Abstract
Valuable information on molecular structure and motion can often be derived from the spin-lattice relaxation times in high resolution NMR spectra,t provided the relevant relaxation mechanisms can be elucidated. For example the relative contribution from dipole--dipole interaction may be deduced from the nuclear Overhauser enhancement2 (1/1) although there are practical difficulties in securing accurate line intensities. This note proposes an alternative method of estimating the dipolar contribution based on rates of spin-lattice relaxation. Consider a system of two spins, ! and S, with four energy levels. The deviations of the spin populations from their equilibrium values are governed by four coupled differential equations of the form,
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